In National Forests, USFS road data usually has sensible information
about the suitability of roads for general traffic.
There's an imagery layer showing the Forest Service data:
https://www.openstreetmap.org/user/Richard/diary/26099
I prefer opening transformed data as a layer in JOSM. Here's the
script I use to translate the data:
https://gist.github.com/maxerickson/32ca41e72458b12a5734f97f75800448
Followed by a command like
ogr2ogr /share/gis/extracts/test.shp /share/gis/USFSOsm/ -clipsrc
-85.2 46.2 -84.5 46.6
to clip out an area of interest. The advantage is not having to
remember a second set of visualizations for the various road features.
Max